Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..46m&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Physics
Scientific paper
Current mechanisms of coronal mass ejection (CME) initiation rely on ad hoc assumptions to energize coronal magnetic fields to erupt. Most notably, artificial shearing of coronal magnetic arcades has been employed for decades to model flares and CMEs while no self-consistent explanation for the shearing motions was known. This talk will focus on the recent discovery that such shearing motions are driven by the Lorentz force that naturally arises when bipolar magnetic fields emerge through the photosphere into the corona. Results of magnetohydrodynamic simulations demonstrate the self-consistent formation of strong shear flows in magnetic arcades and flux ropes that result in the eruption of these structures. The shearing motions transport axial flux and energy from the submerged portion of the field to the expanding portion, strongly coupling the solar interior to the corona. This mechanism is very robust and explains the highly sheared state of the magnetic field associated with prominences, and also explains why these magnetic structures erupt in flares and CMEs.
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